Add sorce code blocks of C to the docs.

docs/chapter_tree/avl_tree.md

@@ -206,7 +206,9 @@ G. M. Adelson-Velsky 和 E. M. Landis 在其 1962 年发表的论文 "An algorit
 === "C"
 
     ```c title="avl_tree.c"
+    [class]{aVLTree}-[func]{height}
 
+    [class]{aVLTree}-[func]{updateHeight}
     ```
 
 === "C#"
@@ -276,9 +278,7 @@ G. M. Adelson-Velsky 和 E. M. Landis 在其 1962 年发表的论文 "An algorit
 === "C"
 
     ```c title="avl_tree.c"
-
-
-
+    [class]{aVLTree}-[func]{balanceFactor}
     ```
 
 === "C#"
@@ -370,7 +370,7 @@ AVL 树的独特之处在于「旋转 Rotation」的操作，其可 **在不影
 === "C"
 
     ```c title="avl_tree.c"
-
+    [class]{aVLTree}-[func]{rightRotate}
     ```
 
 === "C#"
@@ -442,9 +442,7 @@ AVL 树的独特之处在于「旋转 Rotation」的操作，其可 **在不影
 === "C"
 
     ```c title="avl_tree.c"
-
-
-
+    [class]{aVLTree}-[func]{leftRotate}
     ```
 
 === "C#"
@@ -537,7 +535,7 @@ AVL 树的独特之处在于「旋转 Rotation」的操作，其可 **在不影
 === "C"
 
     ```c title="avl_tree.c"
-
+    [class]{aVLTree}-[func]{rotate}
     ```
 
 === "C#"
@@ -615,9 +613,9 @@ AVL 树的独特之处在于「旋转 Rotation」的操作，其可 **在不影
 === "C"
 
     ```c title="avl_tree.c"
+    [class]{aVLTree}-[func]{insert}
 
-
-
+    [class]{aVLTree}-[func]{insertHelper}
     ```
 
 === "C#"
@@ -711,7 +709,11 @@ AVL 树的独特之处在于「旋转 Rotation」的操作，其可 **在不影
 === "C"
 
     ```c title="avl_tree.c"
+    [class]{aVLTree}-[func]{remove}
 
+    [class]{aVLTree}-[func]{removeHelper}
+
+    [class]{aVLTree}-[func]{getInOrderNext}
     ```
 
 === "C#"

docs/chapter_tree/binary_search_tree.md

@@ -74,7 +74,7 @@ comments: true
 === "C"
 
     ```c title="binary_search_tree.c"
-    
+    [class]{binarySearchTree}-[func]{search}
     ```
 
 === "C#"
@@ -145,7 +145,7 @@ comments: true
 === "C"
 
     ```c title="binary_search_tree.c"
-    
+    [class]{binarySearchTree}-[func]{insert}
     ```
 
 === "C#"
@@ -253,7 +253,9 @@ comments: true
 === "C"
 
     ```c title="binary_search_tree.c"
-    
+    [class]{binarySearchTree}-[func]{remove}
+
+    [class]{binarySearchTree}-[func]{getInOrderNext}
     ```
 
 === "C#"

docs/chapter_tree/binary_tree_traversal.md

@@ -57,7 +57,7 @@ comments: true
 === "C"
 
     ```c title="binary_tree_bfs.c"
-    
+    [class]{}-[func]{hierOrder}
     ```
 
 === "C#"
@@ -161,7 +161,11 @@ comments: true
 === "C"
 
     ```c title="binary_tree_dfs.c"
-    
+    [class]{}-[func]{preOrder}
+
+    [class]{}-[func]{inOrder}
+
+    [class]{}-[func]{postOrder}
     ```
 
 === "C#"